ln(x+10)+ln(x-10)=4

Solution for ln(x+10)+ln(x-10)=4 equation:

Simplifying
ln(x + 10) + ln(x + -10) = 4

Reorder the terms:
ln(10 + x) + ln(x + -10) = 4
(10 * ln + x * ln) + ln(x + -10) = 4
(10ln + lnx) + ln(x + -10) = 4

Reorder the terms:
10ln + lnx + ln(-10 + x) = 4
10ln + lnx + (-10 * ln + x * ln) = 4
10ln + lnx + (-10ln + lnx) = 4

Reorder the terms:
10ln + -10ln + lnx + lnx = 4

Combine like terms: 10ln + -10ln = 0
0 + lnx + lnx = 4
lnx + lnx = 4

Combine like terms: lnx + lnx = 2lnx
2lnx = 4

Solving
2lnx = 4

Solving for variable 'l'.

Move all terms containing l to the left, all other terms to the right.

Divide each side by '2nx'.
l = 2n-1x-1

Simplifying
l = 2n-1x-1